The Southern rockers are set to headline the festival along with OutKast and Eminem. Arctic Monkeys, Lorde, Foster the People, Spoon, Interpol, Jenny Lewis, and many more will be there as well.

The festivities officially get under way on Friday, and wrap up on Sunday with the Kings of Leon set. Anyone who didn't get a ticket this year can still get their fill of live music by tuning in to the Lollapalooza Livestream HERE.

iHeartRadio will be on the scene capturing interviews, photos and more with the this year's performing artists. Get Lollapalooza updates all weekend RIGHT HERE!